It would be difficult to convey, by any description, a perfect idea of a building so vast and complicated. A notice of its prominent features must suffice. It is a quadrangle, 234 feet long, and 227 wide. The great dome by which the edifice is surmounted, is flanked or supported by two hemispheres, one on each side, and over each aisle are four smaller ones. A broad flight of marble steps leads to the great door, before which is a façade, which particularly distinguishes this temple. It consists of six pillars of Egyptian porphyry, of immense size and singular beauty. Attached to the edifice are four minarets in front and rear, having galleries ornamented with tracery; and by a singular irregularity, two, having but two galleries, are shorter than the others which have three. Beside it are splendid mausolea, surmounted with domes, under which repose the bodies of the founder and his Sultana. At the head stands a knob covered with his turban, richly ornamented with precious stones, and near it is suspended the Alcoran, from which an Imaum reads a daily portion, for the consolation of him whose ashes repose in the tomb, and who is supposed to hear it. Over one of the gates is an inscription recording its erection. It states that it was built by “the glorious Vicar of Allah, existing by the authority of the mystic Koran, the tenth of the Ottoman emperors, for the faithful people who served the Lord.” It concludes with a prayer, “That the imperial race may never be interrupted on earth, and enjoy eternal delights prepared in paradise.” This mosque, like most others, is surrounded by two areas; one of which, planted with trees, is a common thoroughfare usually filled with groups of people. Here soldiers sometimes encamp, and men of war pitch their tents within the precincts of the mussulman’s God of peace. Here, also, small merchants expose their wares, and no one casts out those who “buy and sell.” Here even a Giaour may pass unobstructed, and the infidel hat be seen mixed with the sacred turban. [Illustration: T. Allom. E. Goodall. THE MOSQUE OF SULTAN ACHMET.] The monarch who erected this mosque, ascended the throne in the year 1603, and at the age of fifteen. He was immediately afterwards seized with the small-pox, and, in order that the janissaries might not avail themselves of his illness, he caused his own brother to be strangled, having first put out his eyes. His object was to deprive the turbulent soldiers of every pretext for dethroning him, as they were disposed to do, when there existed no another of the line of Mohammed to succeed him. His next act was to build a mosque, as fratricide is no impediment to Turkish piety; and it is remarkable, that in this mosque, two centuries afterwards, was the utter extirpation of these janissaries effected.